Refer to the exhibit. A collaboration engineer is configuring the Cisco UCM IM and Presence Service. Which two steps complete the configuration of the SIP trunk security profile? (Choose two.)

Question

Exhibit

Options

• ACheck the box to accept replaces header.
• BCheck the box to allow charging header.
• CCheck the box to enable application-level authorization.
• DCheck the box to transmit security status.
• ECheck the box to accept unsolicited notification.

• A
  89% (57)
• B
  2% (1)
• C
  3% (2)
• D
  6% (4)

Explanation

For the SIP trunk between Cisco UCM and the IM and Presence Service (IMPS), two specific settings are required in the SIP Trunk Security Profile: (A) 'Accept Replaces Header' - IMPS uses the SIP INVITE with Replaces header to perform call transfers and mid-call signaling (such as transferring a chat to a call); UCM must accept this header to support those operations. (E) 'Accept Unsolicited Notification' - IMPS sends SIP NOTIFY messages (for presence, MWI, etc.) without a prior SUBSCRIBE from UCM, so UCM must be configured to accept these unsolicited messages. The other options (charging header, application-level authorization, transmit security status) are not required for this integration.

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